Timothy gingbas



(No Model.)

T. GIN-GRAS. Grinding, Polishing, and Buffing Wheels. No. 230,768. Patented Aug. 3,1880.

Fm 2, F16 J F1634,-

1176 .5. ija. F1617 F1611 Witnesses YO-UTHOGRAPMER. WASNXNGYON D C.

UNITED STATES ATENT Enron.

TIMOTHY GINGRAS, OF BUFFALO, NEW YORK, ASSIGNOR OF ONE-HALF OF HIS RIGHT TO B. HOFFELD, OF SAME PLACE.

GRINDING, POLISHING, AND BUFFING WHEEL.

SPECIFICATION forming part of Letters Patent No. 230,768, dated August 3, 1880,

Application filed June 14, 1880. (No model.)

To all whom it may concern Be it known that I, TIMOTHY 'GINGRAs, of- Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements on Grinding, Polishing, and Buffing Wheels; and I do hereby declare that the following description of my said invention, taken in connection with the accompanying sheet of drawings, forms a full, clear, and exact specification, which will enable others skilled in the art to which it appertains to make and use the same.

This invention has general reference to grinding, polishing, and buffing wheels composed partly of leather and it consists, essentially, in the novel method of producing the leather covering of such wheels.

It consists, furthermore, in the novel combination of parts and details of construction, as hereinafter firstfully setforth and described, and then pointed outin the claims.

In the drawings already mentioned, which serve to illustrate my said invention more fully, Figure 1 is a side elevation of a grinding or polishing wheel constructed according to my invention.- Fig. 2 is a side elevation of the same. Fig. 3 is a longitudinal sectional elevation. Fig. 4 is a similar view of the leather covering detached. Figs. 5, 6, 7, and 8 are detail views of a wheel slightly modified. Fig. 9 is a plan of one of the leather strips of which my wheel is composed.

Like parts are designated by corresponding letters of reference in all the figures.

This wheel is composed essentially of a center piece, A, having an eye,B, for attachment of the wheel to a spindle or shaft, and a rim, 0, for attachment of the leather covering D, hereinafter to be described.

The center piece A may be made in various manners, either wholly or partly of wood or metal, the former method being shown in Figs.

1, 2, 3, 7, and 8, and the latter in Figs. 5 and 6. When made of wood, the center piece is or should be made in sections, as indicated in Fig. 1, to avoid uneven shrinkage on the periphery; but when made of metal no such precaution is necessary. On the periphery of the rim 0, I prefer to form a screw-thread or spiral groove, F, Figs. 3 and 7, so as to retain the leather covering D in position. This covering, as heretofore made, consists of a leather band tightly drawn around the periphery of the center piece, and fastened thereto by glue, cement, wooden pegs or pins, or similar means. This construction, however, is "ery objectionable, because the leather band is liable to get loose. It has, furthermore, the disadvantage that any soft spot in the leather will cause a depression in the grinding'surface, which seriousl y affects the proper working of the wheel. Such a covering has, lastly, the fault that only straight or but slightly-curved faces can be used or produced.

In some cases wheels are made entirely of disks which, although not liable to some of the objections hereinbefore mentioned, are by far too expensive to find general application.

Vith a view of meeting all the objections hereinbefore set forth, and at the same time to produce a first-class wheel at a very low price, a wheel that can be turned into any desired contour suitable for polishing various ornamental or otherwise shaped surfaces, and at the sametimeto also utilize a heretofore waste product, vizthe cuttings or clippings resulting from trimming leather into strips for beltingI construct the covering for my wheels of strips of leather, as illustrated in Fig. 9. These strips I bevel on their ends on opposite sides, as shown at E-, and cement the beveled ends of the various strips together to produce one strip of considerable or any desired length. Such a strip I wind tightly around the periphery or rim 0 of the center piece A, cementing them together until a covering of sufficient width is produced, and then fasten the outermost turns by means of pegs J, or in any other suitable manner. This strip, when tightly woundaround the periphery of the spirally-grooved center piece A in a somewhat moist state will, after contracting in drying, be as firm and solid as a Wheel composed of leather disks, and has the advantage possessed by that class of wheels, thatits periphery may be turned into any desired form to fit specialshaped work, one such wheel being clearly I illustrated in Fig. 8.

On the center piece A, I prefer to form a projecting flange, c, to prevent the covering from screwing ofi the rim, or I form the periphery of said center piece slightly tapering, as illustrated in Fig. 7, so that any possible stretching of the covering will allow the same to screw farther upon the center piece, and thereby to again become tight.

In metallic center pieces, such as shown in Figs. 5 and 6, I prefer to cut a screw-thread upon a reduced portion of the rim and to pass a screw-collar, G, upon this reduced portion, whereby the covering is clamped between the projecting flange c and said collar G, and thus securely retained in position.

It will now be readily observed that this covering, even if 1n ade of new stock, is as cheap, if not cheaper, than the common band-covering, while by utilizing the waste pieces hereinbefore described I can produce a wheel far cheaper than any other heretofore produced.

My improved construction has, furthermore, the advantage that I can manufacture the covering independently of the center piece in various sizes and widths, and thus supply the market with coverings as a new article of manufacture, leaving it to the buyer and user to furnish his own centerpieces, or to replace worn coverings by new ones, thus supplying a want long felt, but never, to my knowledge, satisfactorily met.

I have heretofore always described my invention as applied to grinding, polishing, and buffing wheels. A moments reflection, however, will convince any one that this invention is also admirably applicable to and for pulley, wheel, and roller coverings, it being a fact that a grinding, &c., wheel is a pulley as long as the abradin g material has not been applied'to its periphery.

Having thus fully described my invention,

40 I claim I 1. In buffin g, polishing, and grindin g wheels,

pulleys or rollers having a center piece, A, formed with a spiral groove around its periphery, a covering, D, composed of a strip of leather arranged spirally around and fitting into the grooves of the periphery of said center piece, as specified.

2. A buffing, polishing, or grinding wheel, pulley, or roller having a tapering rim provided with spiral grooves and a covering composed of strips arranged spirally around and fitting into the grooves of said periphery, substantially in the manner as and for the object specified.

3. In the manufacture of grinding and other wheels having a solid center and an elastic covering, the method of producing said covering, which consists in first splicing together strips of leatherof proper width and thickness, then winding said strips in a somewhat moist state around the periphery of a mandrel, (cemcntin g the layers together on their adjoining sides during the winding process,) then securing the ends, and finally turning the periphery of said covering to the desired shape whereby a covering is produced in which the grain of the leather is exposed to wear, which is capable of being turned to any desired contour, which may be made of any desired thickness and width, and whereby, lastly, spots or places of low density in the leather are better distributed over the wearing-surface of said covering, substantially as herein before set forth and described.

In testimony that I claim the foregoing as my invention I have hereto set my hand in the presence of two subscribing witnesses.

TIMOTHY GINGRAS.

Attest:

MICHAEL J. STARK, FRANK HIRSOH. 

